JPH0726979A - Working machine - Google Patents

Abstract

PURPOSE:To enable work to be carried out in a narrow place by decreasing the breadth of a machine body in a working machine provided with a working part on the lower part of an engine. CONSTITUTION:An engine E connected to the upper part of a working part R is longitudinally arranged in its state where a cylinder barrel 16 is turned frontward and also a crank case 15 is turned backward. A muffler 65 is provided ahead of the cylinder barrel 16, a fuel tank 68 is provided behind the crank case 15, and an air cleaner 67 is provided under the fuel tank 68. The peripheries of the engine E, the muffler 65, the fuel tank 68 and the air cleaner 67 are covered by an engine cover 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler near an engine body having a cylinder barrel and a crankcase.
The present invention relates to a working machine in which a fuel tank and an air cleaner are arranged, and a working section is connected to a power take-off shaft projecting downward from the engine body.

[0002]

2. Description of the Related Art A vertical crankshaft type engine used for a working machine such as a cultivator generally has a structure in which auxiliary equipment such as a fuel tank, a carburetor and an air cleaner are laid out near an engine body supported above a working section. (For example, Japanese Utility Model Laid-Open No. 58-63329 and Japanese Utility Model Publication 56).
-25025).

[0003]

By the way, since the above-mentioned conventional working machine is equipped with an auxiliary machine on the side portion of the engine body, the lateral width of the machine body increases, and work is performed in a narrow place such as a tea plantation. In this case, there are problems such as causing trouble and damaging the tea leaves due to contact with the machine body.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reduce the lateral width of a working machine as much as possible to improve the efficiency of work in a narrow space.

[0005]

In order to achieve the above object, the invention described in claim 1 is to dispose a muffler, a fuel tank and an air cleaner in the vicinity of an engine body having a cylinder barrel and a crankcase, In a working machine in which a working unit is connected to a power take-off shaft projecting downward from the engine body, a muffler, a cylinder barrel, a crankcase, and a fuel tank are arranged in the front and rear direction from the front side to the rear side in the traveling direction of the working unit. It is characterized in that an air cleaner is disposed below the fuel tank.

The invention described in claim 2 is characterized in that, in addition to the structure of claim 1, the engine body, the muffler and the air cleaner and a part of the fuel tank are covered with an engine cover.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

As shown in FIGS. 1 to 4, a walk-type cultivator T as a working machine is equipped with an engine cover 1 made of synthetic resin for covering the outer periphery of the engine.
At the lower part of the steering handle mounting member 2 and the transmission case 3, a tilling part R constituting a working portion is provided, and at the upper end of the steering handle mounting member 2, a steering handle 4 extending rearward and upward is provided. The cultivating part R includes a cultivating shaft 5 extending in the left-right direction, a pair of left and right inner rotors 6 and 6 and a pair of left and right outer rotors 7, 7 attached to the cultivating shaft 5.
With. Each inner rotor 6 has four tillers 6 ₁ ,
6 ₁ ; 6 ₂ and 6 ₂ are provided, and the two plowing pawls 6 ₁ and 6 ₁ are bent inward in the left-right direction, and the remaining 2 plowing pawls 6 ₂ and 6 ₂ are bent outward in the left-right direction. To be
Further, each outer rotor 7 is provided with four plowing pawls 7 ₁ ... And these plowing pawls 7 ₁ are bent inward in the left-right direction. The U-shaped steering handle 4 has a joint 8 at its lower end and a bolt 10 having a handle 9.
Is removably fixed to the upper end of the steering handle attaching member 2. A throttle lever 13 connected to the cab throttle of the engine via a throttle wire 12 is provided on one of the handle grips 11, 11 provided at the upper end of the steering handle 4. The throttle wire 12
A handle post 31 and engine covers 45, 4 which will be described later.
It is connected to the cab throttle through the cooling air inlets 69, 69 provided between the six.

As shown in FIG. 6, the engine E has a single cylinder 2
The cycle engine is provided with an engine body 17 including a crankcase 15 and a cylinder barrel 16.
The engine body 17 is arranged in the front-rear direction with the cylinder barrel 16 positioned on the front side and the crankcase 15 positioned on the rear side. A carburetor 18 is provided on the rear surface of the crankcase 15, and a recoil starter 20 having a handle 19 (see FIG. 5) exposed to the outside of the engine cover 1 is provided on the upper surface of the crankcase 15. The air duct 21 integrally provided in the lower portion of the engine body 17 includes an inlet opening 21 ₁ located at both left and right side portions and a rear portion of the crankcase 15, and a cylinder barrel 16.
The intermediate opening 21 ₂ located at the bottom of the cylinder barrel 1
And an outlet opening 21 ₃ located at the top of 6.

The engine E is supported on an engine bed 22 whose upper surface is open. A flywheel 25 and an automatic centrifugal clutch 26 are supported on a crankshaft 24 protruding downward from the crankcase 15 of the engine E and supported by a ball bearing 23 so as to be positioned inside the engine bed 22. Flywheel 25
An annular cooling fan 27 attached to the upper surface of the air duct faces the inlet opening 21 ₁ and the intermediate opening 21 ₂ of the air duct 21.

The steering handle mounting member 2 includes a plate-shaped mounting plate 29 fixed to the lower surface of the engine bed 22 with bolts 28, and a pipe-shaped transmission coupling member 30 projecting downward on the lower surface of the mounting plate 29. , A pipe-shaped handle post 31 extending rearward and upward from the rear portion of the mounting plate 29, the lower surface of the mounting plate 29, and the transmission coupling member 3
0 and the front end of the lower end of the handle post 31 are integrally connected to each other, and a plate-like connecting reinforcing plate 32 is formed.

As is apparent from FIG. 4, the coupling reinforcing plate 32 not only reinforces the steering handle mounting member 2 to strengthen the support of the steering handle 4, but also the left and right inner rotors 6 and 6. the located tilling claws ₆₁ ... facing portion of which is curved inwardly provided two each tilling claws ₆₁ ...
It has the function of dropping pebbles S and mud sandwiched between them. This effectively prevents stacking of the inner rotors 6,6 during plowing.

Returning to FIG. 6, inside the transmission case 3 which is attached to the transmission connecting member 30 of the steering handle attaching member 2 at the lower end via the connecting member 33, a cylinder is provided via a pair of upper and lower ball bearings 34, 34. A worm 35 is supported, and this cylindrical worm 35 is connected via a transmission shaft 38 to a power take-off shaft 37 of the automatic centrifugal clutch 26 supported by a ball bearing 36. The cylindrical worm 35 meshes with a worm wheel 39 provided on the cultivating shaft 5 that supports the inner rotors 6, 6 and the outer rotors 7, 7. Therefore, the driving force of the engine E is the crankshaft 2
4, the automatic centrifugal clutch 26, the transmission shaft 38, the cylindrical worm 35 and the worm wheel 39 are transmitted to the cultivating shaft 5 to drive the inner rotors 6 and 6 and the outer rotors 7 and 7 provided on the cultivating shaft 5. The cylindrical worm 35 and the worm wheel 36 form a worm gear.

As will be apparent with reference to FIGS. 6 and 13, a resistance rod mounting member 40 having a U-shaped cross section is welded to the rear surface of the handle post 31 and supported by the resistance rod mounting member 40. The L-shaped resistance rod 41 has a mounting portion 41 ₁ slidably fitted to the resistance rod mounting member 40,
The resistance portion 41 ₂ extends rearward and downward from the mounting portion 41 ₁ . By resistance rod mounting member 40 to a plurality of pin holes 41 ₃ ... and formed into the pin hole 40 ₁ and the mounting portion 41 ₁ of the are passed through the pin 42 and fixed by a clip 43, the resistance bar 41 is adjustably vertically positioned Fixed. With the resistance rod 41 fixed to the resistance rod mounting member 40, the mounting portion 41
₁ Front are in close contact along the rear face of the handle post 31 (see FIGS. 1 and 6). As a result, the load received by the resistance portion 41 ₂ of the resistance rod 41 is directly transmitted to the handle post 31, so that the resistance rod 41 has a simple structure with a small number of parts.
Can be firmly supported.

Next, the engine cover 1 that covers the engine E
The structure of is explained.

The engine cover 1 made of synthetic resin is composed of a left cover 45 and a right cover 46 which are divided into left and right parts with a center line extending in the front and rear direction of the machine body in between. The left cover 45 and the right cover 46 are spigot-engaged with each other at their mating surfaces on their outer circumferences, and the five bolts 47 to 51 are attached.
Are integrally connected with each other (see FIG. 6). A carrying handle 52 is integrally formed on the engine cover 1 for an operator to carry the cultivator T while carrying it.

As is apparent from FIGS. 6 and 8, a stay 55 is fixed to the front wall surface of the crankcase 15 via three bolts 53 ... And a connecting member 54. Stay 5
The engaging portion 55 ₁ formed at the upper end of the engine cover 5 is the engine cover 1
The left cover 45 and the right cover 46 are supported by the stay 55 by a bolt 47 that engages with a pair of boss portions 56 and 57 protruding from the inner surface of the boss 56 and penetrates one boss portion 56.
As is clear from FIGS. 6 and 7, the crankcase 15
A stay 58 is provided upright on the rear upper wall surface. The stay 58 and the boss portion 5 projecting from the inner surface of the engine cover 1 are provided.
The left cover 45 and the right cover 46 are supported by the stay 58 by bolts 48 penetrating through 9 and 9. Therefore,
The upper portion of the engine cover 1 is supported by the engine body 17 via two bolts 47, 48 and two stays 55, 58.

As is apparent from FIGS. 6 and 10, the upper ends of the rear portions of the left cover 45 and the right cover 46 are integrally connected by a bolt 49 penetrating a boss portion 60 projecting from the inner surface thereof. Further, as is clear from FIGS. 6 and 9, a bracket 22 ₁ having a groove opened downward is provided at the front end of the engine bed 22, and the left cover 45 and the right cover 46 are provided with the groove of the bracket 22 ₁ . Rib on 61
Are joined together by bolts 50. Similarly, the ribs 62 of the left cover 45 and the right cover 46 are fitted into the groove of the bracket 22 ₂ protrudingly provided at the rear end of the engine bed 22, and are integrally connected at 51. Therefore,
One bolt 4 is provided at the rear of the left cover 45 and the right cover 46.
9 and the left cover 45 and the right cover 4 are integrally connected.
The lower part of 6 is an engine bed 2 with two bolts 50 and 51.
Supported by 2.

As described above, by completely covering the engine E with the left and right divided engine covers 1, the number of parts can be reduced as compared with the case where the engine E and its accessories are covered with separate covers. The mating surfaces can be easily sealed. Furthermore, it is possible to prevent noise of the engine E from leaking to the outside, prevent mud and dust from adhering to the engine E, and improve the appearance.

As is apparent from FIG. 1, the center of gravity CG of the cultivator T is located below the carrying handle 52. Therefore, as shown in FIG. 14, when the operator grips the carrying handle 52 and transports the tiller T, the tiller R having a wide width in the left-right direction comes to be located in front of the operator's body. It avoids contact with the body and becomes easy to carry. Further, in FIG. 6, the nut 28 ₁ screwed into the bolt 28 is loosened to loosen the steering handle attaching member 2
The engine E covered by the engine cover 1 is separated from the engine bed 22 by operating the steering handle attaching member 2, the mission case 3, the tillage section R, and the steering handle 4.
And it can be removed from the resistance rod 41. As a result, the engine E can be commonly used for purposes other than the cultivator T, for example, lawn mowers, sweepers, mowers, chainsaws and the like. Even when the engine E is removed, the carrying handle 52 can be used to easily carry it. Further, since the flat engine bed 22 is located on the lower surface of the engine cover 1, the engine E can be stably placed on the ground or floor without tipping over.

Next, the cooling structure of the engine E mounted inside the cover 1 will be described.

As shown in FIGS. 5 and 6, the left cover 45
Inside the engine cover 1 composed of the right cover 46, the muffler 65 with the exhaust port 65 ₁ facing forward, the exhaust pipe 66, the cylinder barrel 16, the crankcase 15, the carburetor 18, and the air cleaner 67 are directed from the front to the rear. The carburetor 18 and the air cleaner 67 are sequentially arranged.
A fuel tank 68 is disposed on the upper part of the so that the upper half part thereof is exposed from the engine cover 1.

As described above, the engine main body 17 is vertically installed so that the cylinder barrel 16 and the crankcase 15 are positioned in the front-rear direction, and the muffler 65 and the fuel tank 68 are arranged in front of and behind the cylinder barrel 16, respectively. In addition, since the carburetor 18 and the air cleaner 67 are arranged below the fuel tank 68, the width of the engine E including the auxiliary machinery in the left-right direction, that is, the width of the engine cover 1 in the left-right direction is narrowed as much as possible. It becomes possible. as a result,
When working in a narrow space such as a tea plantation, it is possible to avoid the contact between the machine body and the crops and perform efficient work.

An opening extending in the vertical direction is formed in the mating surface of the left cover 45 and the right cover 46 at the rear end of the engine cover 1, and the handle post 31 is formed in this opening.
The lower half of the fit. A pair of left and right cooling air inlets 69, 69 are formed between the handle post 31 and the edge of the opening (see FIGS. 5 and 6). The ribs 70, 70 projecting inward from the lower part of the opening are brought close to the outer periphery of the handle post 31 to prevent air from flowing, so that the cooling air intake ports 69, 69 are compared at the rear end of the engine cover 1. A relatively high position (between the resistance rod mounting member 40 and the bolt 49 connecting the engine cover 1) (see FIG. 4). As a result, when the cooling air is sucked into the engine cover 1 from the cooling air suction ports 69, 69, it is possible to suck in relatively clean air with a small amount of dust, which is separated upward from the tillage part R. On the other hand, louver-shaped cooling air exhaust ports 71, 71 are formed at the front end of the engine cover 1, and the exhaust port 65 _{1 of the} muffler 65 faces a hole formed in the lower part of the cooling air exhaust ports 71, 71. To do.

As described above, when the cooling air inlets 69, 69 are formed between the rear ends of the left cover 45 and the right cover 46, when the resin left cover 45 and the right cover 46 are molded by a mold. In addition, the cooling air suction ports 69, 69 can be formed by a mold having a simple structure and without machining after the molding.

As is apparent from FIGS. 6 to 8, partition walls 72 and 73 extending in the vertical direction are integrally formed on the inner surfaces of the left cover 45 and the right cover 46, respectively. Left cover 4
The partition wall 72 formed at 5 has a shape along the outer shape of the stay 55 at the upper part thereof, and extends downward from the partition wall 72 with a substantially constant width. On the other hand, the partition wall 73 formed on the right cover 46 has a shape along the outer shape of the stay 55 at the upper part thereof, and from there, the engine body 1
7 extends downward along the boundary between the crankcase 15 and the cylinder barrel 16. The inside of the engine cover 1 is partitioned by the partition walls 72 and 73 into a rear chamber 74 on the cooling air intake port 69, 69 side and a front chamber 75 on the cooling air discharge port 71, 71 side (see FIG. 6). An inlet opening 21 _{1 of the} air duct 21 opens in the chamber 74, and an outlet opening 21 _{3 of the} air duct 21 opens in the front chamber 75.

Thus, the crankshaft 2 of the engine E
Cooling fan 27 integrated with flywheel 25 provided in No. 4
When the fan rotates, its negative pressure causes the cooling air suction ports 69, 6
The air sucked in from 9 flows into the rear chamber 74 to cool the fuel tank 68, the carburetor 18 and the crankcase 15, and then flows into the air duct 21 from the inlet opening 21 ₁ to cool the automatic centrifugal clutch 26. To do. Wind duct 21
The cooling air passing through the intermediate opening 21 ₂ of the cylinder barrel 16
And is discharged to the front chamber 75 through the outlet opening 21 ₃ , where the exhaust pipe 66 and the muffler 65 are cooled and discharged from the cooling air discharge ports 71, 71 to the outside of the engine cover 1.

As described above, the low temperature fuel tank 68 and the carburetor 18 are arranged on the cooling air intake ports 69, 69, and the intermediate temperature crankcase 15 and the automatic centrifugal clutch 26 are arranged on the downstream side. Further, since the high temperature cylinder barrel 16, the exhaust pipe 66, and the muffler 65 are arranged on the side of the downstream cooling air discharge ports 71, 71, the heat of the cylinder barrel 16, the exhaust pipe 66, and the muffler 65 is transferred to the fuel tank 68 and Not only is it difficult to reach the carburetor 18, but even if the temperature of the cooling air gradually rises along the flow path of the cooling air,
It is possible to always secure the temperature difference between the cooled portion and the cooling air and effectively cool all the cooled portions. Moreover, the cooling air is taken in from the rear part of the machine body where the operator is located, and the exhaust gas and the cooling air of which the temperature has risen are discharged to the front side from the front part of the machine body on the side opposite to the operator. There is no danger of deteriorating the working environment or damaging the crops on the ground.

Next, the support structure of the fuel tank 68 will be described.

As shown in FIG. 6, the fuel tank 68 is integrally formed of synthetic resin, and a fuel supply port 68 ₁ is provided on the upper surface thereof. The lower portion of the fuel tank 68 and the carburetor 18 are connected via a fuel tube 81,
A fuel cock 82 is interposed in the middle of the fuel tube 81. As shown in FIGS. 10 and 11, the fuel tank 6
A concave groove 68 ₂ having a U-shaped cross section is formed on the outer periphery of the engine 8, and the lower part of the concave groove 68 ₂ is the engine cover 1
And the upper part is exposed upward from the engine cover 1. The rear portion of the groove 68 ₂ has a cross section U.
It is not in the shape of a letter, and the lower side is open (see the right-side cross section in FIG. 11).

As is apparent from FIG. 10, the right cover 46
Is fitted to the support pin 46 ₁ protruding from the left cover 45.
Grommet 83 held in the support hole 45 ₁ formed in
Fits in the front end of the groove 68 ₂ . A pair of left and right grommets 84, 84 is held on the outer periphery of the boss portion 60 projecting from the inner surface of the engine cover 1. The grommets 84, 84 are formed in a recess 68 ₃ formed in the lower rear portion of the fuel tank 68. Mating. Further, a pair of protrusions 68 ₄ , 68 ₄ projecting from the left and right side surfaces of the fuel tank 68 are fitted to the pair of rubber bushes 85, 85 held on the inner surfaces of the left cover 45 and the right cover 46. Thus, the fuel tank 68 is positioned in the front-rear direction by the three grommets 83; 84, 84, and the two rubber bushes 8 are provided.
5, 85 are positioned in the left-right direction, and the grommet 83; 84, 84 and rubber bushes 85, 85
Floatingly supported by the engine cover 1. As a result, the vibration transmission from the engine E to the fuel tank 68 can be effectively prevented while the fuel tank 68 is stably supported with a small number of parts.

As is apparent from FIG. 11, the fuel tank 6
To make the upper half of 8 project upward from the engine cover
Edges of openings formed in the left cover 45 and the right cover 46
45 ₂, 46₂The neighborhood bends inward and upward and burns.
Groove 68 of the material tank 68₂Fit inside. And the groove
68₂The groove 68 is formed on the lower surface of the upper wall.₂Over the entire length of
Rib 68_FiveIs projected downward. Draining rib 68_Five
Is an edge 45 of the left cover 45 and the right cover 46.₂, 46₂
Is located on the outer side of the fuel tank 68 and is located along the side wall of the fuel tank 68.
Water drops flowing down and the fuel supply port 68 of the fuel tank 68₁
Fuel overflowing from the draining rib 68_FiveStopped by and fall
However, the water droplets and the fuel may cause the edge 45.₂, 46₂Beyond
It is prevented from flowing into the engine cover 1.
(See arrow A in FIG. 11).

Next, the structure of the air cleaner 67 will be described.

As shown in FIGS. 6 and 7, the air cleaner 67 comprises an air cleaner case 86, an air cleaner element 87 and an air cleaner cover 88.
Air cleaner case 86 having a cup shape with a circular cross section
Are integrally projected from the rear side surface of the left cover 45 toward the inside. The opening of the air cleaner case 86 is covered with an air cleaner cover 88 which is removable from the outside of the left cover 45, and a dirty chamber 89 is formed outside the air cleaner element 87 housed inside the air cleaner case 86. A clean chamber 90 is formed inside the air cleaner element 87.

A boss 91 is provided on the inner surface of the left cover 45 so as to support the fuel cock 82. An upper partition rib 92 is formed between the air cleaner case 86 and the upper inner surface of the left cover 45, and a lower partition rib 93 is formed between the air cleaner case 86 and the boss 91. The air cleaner case 86 has a pair of intake holes 8 communicating with the dirty chamber 89 so as to be located in front of the upper partition ribs 92 and the lower partition ribs 93.
6 ₁ , 86 ₁ are formed, and the clean chamber 90 is connected to the carburetor 18.

Thus, the air sucked from the cooling air intake ports 69, 69 by the negative pressure generated by the cooling fan 27 is
The intake holes 86 ₁ , 86 ₁ of the air cleaner case 86 are blocked by the upper partition ribs 92 and the lower partition ribs 93.
Cannot flow directly into the dirty chamber 89, bypassing the right cover 46 side and wrapping around to the front side of the upper partition rib 92 and the lower partition rib 93, and then flowing backward from the intake holes 86 ₁ and 86 ₁ into the dirty chamber 89. . As described above, while the air supplied to the air cleaner 67 is diverted, dust contained in the air can be dropped to supply clean air, and the clogging of the air cleaner element 87 can be prevented. Then, the air that has flowed into the dirty chamber 89 passes through the air cleaner element 87 to completely remove dust, and then the carburetor 1 passes through the clean chamber 90.
8 are supplied.

Even if water enters the inside of the engine cover 1 from around the fuel tank 68, the water is blocked by the upper partition ribs 92 and the lower partition ribs 93 provided on the left cover 45. As a result, water does not flow into the intake holes 86 ₁ , 86 ₁ of the air cleaner case 86, which prevents water from adhering to the air cleaner element 87 and causing clogging.

As described above, since the air cleaner case 86 is formed integrally with the left cover 45, the number of parts such as the mounting bracket and the bolt can be reduced and the cost can be reduced. Further, by removing the air cleaner cover 88, the air cleaner element 87 can be easily replaced from the outside of the left cover 45, so that workability is greatly improved. Further, since the left cover 45 supports the air cleaner 67 and the fuel cock 82, and the right cover 46 does not support any auxiliary machinery, the right cover 46 can be easily removed to easily perform maintenance of the engine E. .

Although the embodiments of the present invention have been described in detail above, the present invention is not limited to the above embodiments, and various design changes can be made.

[0040]

As described above, according to the invention described in claim 1, the muffler, the cylinder barrel, the crankcase and the fuel tank are arranged in the front-rear direction from the front side to the rear side in the traveling direction of the working portion. By arranging them sequentially and arranging an air cleaner below this fuel tank, the engine body and each auxiliary machine are laid out in the front-rear direction to reduce the lateral width of the working machine as much as possible, for example, in a narrow space such as a tea plantation. In such a place, it is possible to perform efficient work while avoiding contact between the tea leaves and the machine body near the engine body of the working machine that is approximately the same height as the tea tree.

According to the invention described in claim 2,
By covering the engine body, muffler and air cleaner, and part of the fuel tank with the engine cover, not only is it possible to prevent dirt from adhering to the engine body and each auxiliary equipment and dust from being sucked into the air cleaner, It is possible to block noise and reduce the noise of the working machine.

[Brief description of drawings]

[Figure 1] Overall side view of the cultivator

FIG. 2 is a two-direction arrow view of FIG.

FIG. 3 is a view taken along the line 3-3 of FIG.

FIG. 4 is an enlarged view in the four directions of FIG.

5 is an enlarged view of a main part of FIG.

FIG. 6 is an enlarged cross-sectional view of the main part of FIG.

7 is a sectional view taken along line 7-7 of FIG.

8 is a sectional view taken along line 8-8 of FIG.

9 is a sectional view taken along line 9-9 of FIG.

10 is a sectional view taken along line 10-10 of FIG.

11 is a sectional view taken along line 11-11 of FIG.

12 is a sectional view taken along line 12-12 of FIG.

13 is a sectional view taken along line 13-13 of FIG.

FIG. 14 is an explanatory diagram of operation

[Explanation of symbols]

 1 Engine Cover 15 Crankcase 16 Cylinder Barrel 17 Engine Main Body 37 Power Extraction Shaft 65 Muffler 67 Air Cleaner 68 Fuel Tank R Tillage Section (Working Section)

Claims (2)

[Claims] 1. A muffler (65), a fuel tank (68) and an air cleaner (67) are disposed in the vicinity of an engine body (17) having a cylinder barrel (16) and a crankcase (15), and the engine body ( 17) A working machine in which a working part (R) is connected to a power take-off shaft (37) projecting downward from the working part (R) in a traveling direction from a front side to a rear side of the muffler (65). , A cylinder barrel (16), a crankcase (15) and a fuel tank (68) are sequentially arranged in the front-rear direction, and an air cleaner (67) is arranged below the fuel tank (68). Machine. 2. An engine body (17) and a muffler (6
5) and the air cleaner (67) and the fuel tank (68)
The work machine according to claim 1, wherein a part of the work machine is covered with an engine cover (1).